UMI Performance

Bolt-in Rear Coilover Kit for 1982-2002 Camaro and Firebird
P/N 2046 priced at $659.99/set

UMI Performance, Inc is proud to introduce our P/N 2046 GM F-body bolt-in rear coilover kit. This kit allows installation of a true 2-1/2” dia racing coilover spring and double rod end performance shock. It allows the user to accomplish ride height, easy spring rate changes, and damping adjustment on the 3rd and 4th Gen F-body rear. An innovative, TIG welded lower bracket holds the shock in double shear and works with standard axle mounts as well as with most common relocation brackets (spacers included). Drilling two 3/8” holes is required (no welding). The teardrop shaped upper mount is also double shear and features a straight pull design for optimum performance. The 2046 kit provides ride height adjustment as well as 19 compression and 19 rebound adjustment positions on the Viking shock. The Viking springs are available in 12” 150lb/in for handling, 14” 125lb/in for general use and 14” 110lb/in for street/strip. All UMI components are 100% manufactured in Philipsburg, PA-USA.

82-02 GM F-Body Rear Coilover Kit, Bolt-In, Double Adjustable Shocks

UMI Performance

A few more pictures of the kit.

paul_huryk

Sweet!

88gunmetalgta

iTrader: (1)

I'm curious what the Viking shock P/N is that you use with that kit? C211 are the ones I have IIRC.

robertfrank

iTrader: (27)

$hit just got real!!

jakemussman

iTrader: (3)

Damn those are sexy!

drdave88

iTrader: (3)

Uh, yes please!!

Dueling73s

iTrader: (4)

Looks like a nice kit. How low can it go below stock height??

The Project

iTrader: (6)

VERY nice.....might need to start saving

Kat

iTrader: (4)

Just curious. How is the ring portion spreading the load throughout that area? It isn't tied into anything. The way that you have it now , it is just going along for the ride

Pocket

iTrader: (24)

^

Also, is there a single 3/8" bolt mounting the bottom of the assemblies to the axle? Seems like a lot of weight/force on two bolts

KITT1983

iTrader: (3)

Will this work with the stock ride height?

redneckjoe

that was my first thought.
i think i'd be somewhat concerned about that mounting point.
i guess time will tell as people give feedback?
interesting design none the less.

Marc 85Z28

iTrader: (3)

Does this kit offer any advantage over the Autofab setup?

articwhiteZ

iTrader: (56)

As time passes. Im sure a 2nd bolt to the lower will get added. The QA1 rear coil over kit I picked up last week. As a way dif looking lower bracket 2 bolts. With side wall gusset.with a silver zink plate..but there kit is $30 more. .at $700

KITT1983

iTrader: (3)

Will this work with stock ride height?

articwhiteZ

iTrader: (56)

Yes...and you can also set the ride ht You would like.

UMI Sales

C211 is the standard shock we are using. If you already have C211's, you can use our bracket kit to be debuted soon.

UMI Sales

Stock ride height, no problem. It goes from stock to the bump stops, give or take a bit depending on exact application.

UMI Sales

The photo was missing the main bolt (sorry, prototype photo). The lower bracket is held primarily by the 1/2-13 bolt in place of the original shock bolt. The double shear mount also uses a 1/2-13 fastener. The 3/8 is just a helper.

FEA of the lower mount shows a large factory of safety compared to the available rate of the spring. We recommend you use bump stops to stop short of coil bind and/or shock shaft bottoming as a precaution.

UMI Sales

Hmm, not familiar with the Autofab stuff. May have to check it out.

The cool thing about our kit is it will hold pretty much any standard 2-1/2" coilover. We are going to try some Afco's next...

The Vikings are very popular nowadays. Nice price, great quality, wide adjustment range.

TEDSgrad

iTrader: (4)

Lowering the axle mount below stock (extending the mount towards ground) would give better piston travel for us lowered guys.

UMI Sales

Request noted.

UMI Sales

I checked the Autofab setup. Our lower bracket is a different design with an added reinforcement bolt.

The upper bracket is a teardrop shape and allows the use of a standard style spring while also providing extra reinforcement.

The bracket system allows the use of a rod end racing shock in place of the standard upper stud type. This in turn allows for a huge expanse in the shocks available for the platform.

UMI Sales

The double shear mount is centered over the mounting bolt. We just wanted a nice flat plate to weld to. It makes the product more of a robust design. It may not even stay that way forever...

Roostmeyer

iTrader: (3)

Koni 30-5436 with a coil over kit would be perfect with these...

The bump dampening is spot on to the off the shelve koni yellow's with a little more rebound adjustment. They can be ran inverted as well so you can lower unsprung weight.

1BADRZ28

iTrader: (2)

That clevis will eventually mar and damage the bottom of the coil over with axle rotation whether it from extension/compression or simply jacking the car up. I'd take some material away from that clevis. I did that to prevent it.

Pocket

iTrader: (24)

Very glad UMI did the homework

cs80camaro

Very nice set up. Adding to my to do list.

92BLKL98

I'm thinking about a coil-over kit on my '92. How does this affect ride manners on the street? Everyone I have talked to say if it's a daily driver I will not be happy if a weekend racer its OK. What is everyone's experience?

UMI Sales

We have three spring rates available, 110, 125 and 150. The 110 and 125 feel pretty "stock" while the 150 gives a crisp handling feeling. Technically you're taking the factory tuned spring out (and the associated rubber damper up top) and replacing it with a spring in a slightly different location and using double shear solid mounts. Ride manners are crisp/performance as opposed to soft and squishy.

As for the shock, we have all our cars on Vikings nowadays and love driving them on the track and street. One car we use as a commuter for the team when at shows (4 guys in a 4th Gen with luggage is interesting) and it rides fine.

ramey

92BLKL98

Sounds good this has been on my wish list so I will be in contact. You guys are masochists, my back seat has only seen children and has not been used in years. I keep it folded down. I consider the car a 2 seater. When going out with friends we take the other guys car or two cars.

KITT1983

iTrader: (3)

How does your kit handle on the street over stock?

UMI Performance

The kit will handle great. The handling will depend on the shock, not the fact that it is now a coil over. We use the Viking because of the adjustment, you can easily tune the shock for drag, street and autox. We have reviewed many other shock dyno curves and the double adjustment of the Viking allows you to set it very similar to many other brands.

UMI Performance

Here are a few pictures to show our bolt in lower shock mount used on the coilover kit. As you can see we require one hole to be drilled with a 3/8" drill. The included spacer shown behind the bracket allows the coil over kit to be used with relocation brackets as well. The bracket shown can also be used as a shock location bracket, we will be releasing that next.

92BLKL98

Does the kit also include the spacer for the 3/8" bolt above LCA relocation bracket tab?

92BLKL98

I had been looking at the kit Steve Spohn offers his upper load bearing plates are required to be welded in. So why do yours not require welding, and is it really necessary to weld?

UMI Performance

Yes the kit includes the spacer. The spacer works well with our relocation brackets and will work the same with others built from 0.188" thick steel.

We do not require welding on ours. Of course if you want to you can, but we do not require it.

Thank you.

paulmoore

I am definitely interested in this...just a quick question though. Obviously this kit is designed to work with the OEM axle. I just went on the UMI site and saw this...

"We have also confirmed this kit to work on Moser Engineering and Strange brand rear ends."

Just curious to know if you plan on testing fitment and/or creating lower shock mounting brackets for other types of rear end manufacturers. I only ask because I have a Currie built 9 inch Ford housing in my camaro and I am not sure if the brackets you currently offer will work. Thanks for any info.

UMI Performance

We have tried the Moser and Strange rear ends because we have those rear ends here. The shock mounts on all rear ends are very similar, the companies change the angles slightly and each vary slightly but we can't imagine this not fitting with out a few extra washers as spacers.

I hope that helps,
Ryan

paulmoore

Honestly, I would figure that the rear end design would probably be somewhat similar seeing as how the lower shock mounts would have to be in the same location for it to even bolt in to the car. Essentially, like you said, it might only require minor modifications to make this work. You don't happen to be working on developing a front coilover setup for this car, do you? I only ask because I am *particular* and like to keep matched components and if I use these in the rear then I would most definitely be on the hook for a set to match up front.

Also, I know you have probably done countless hours of R&D and road ttesting with this kit. Did you notice any unbalance with say, your coilovers in the rear and the factory style suspension up front?

Thanks for answering all my questions!

UMI Performance

Correct. All the rear ends should be similar. For example the Moser rear end has a different angle on their shock mounts so you would need to use a few extra washers to match the angle. Very simple to do and I imagine all rear ends are very similar in this aspect.

We have found the kit to work very well on the street and autox use with no unbalanced feel. We are very happy with the feel on the coil over set up.

A front kit may come in the future, I think Viking is also working on their own front end kit. The cool thing about these coil over kits is we don't have to use the Viking shock, we can use many other shocks. So if you wanted to match to the front we could use a QA1 rear shock and match to a QA1 coil over kit...so this is always an option. QA1 offers a front kit for the 82-92.

I hope that helps!

UMI Performance

I wanted to add a few more pictures of the new rear kit installed, these pictures show the top mount and also how they work with relocation brackets.

This kit is bolt on and we supply 3/16" thick spacers to space the shock mount out to clear relocation brackets.

UMI Performance

Here is another picture to share.

This is Jerry's 99' SS sitting on front and rear coil overs and lowered approximately 2". Pretty cool stance! And Alex looks pretty awesome too.

Buggy Disaster

iTrader: (1)

Ok, this seems interesting.

Can you list the advantages that I will gain from stock to your rear coil over kit? My car has a LS1/T56 and is most importantly a daily driver. It will be auto crossed and see road course at Road Atlanta a few times a year. I want the car to handle like it is on rails, yet still be comfortable enough for long road trips with the girlfriend.

So with that said, will I benefit from this kit? Or does this setup apply more to the drag racing guys?

UMI Sales

Our kit comes with three spring choices. 110, 125 and 150 lb/in. Due to the configuration you can also choose from hundreds of other rates (although we carry only our base rates). There is some trade-off in ride comfort with 150's, although not much. Auto-x and road course at Road Atlanta would call for 150's and would contribute to excellent handling. Damping is such with the double adjustable that you can make it reasonably comfortable.

On the flip side you could choose 110's for a plush ride but at the expense of auto-x and road course handling. We are still testing so I can't say with data but I'd imagine the car would understeer at the limit due to the grip provided by the low rear spring rate.

DBLTKE

iTrader: (1)

Looks pretty good. Are you able to offer higher spring rates? I currently run 200lb rears and plan on stepping up to 250lb very soon. Also, do you have dimensions for total shock height, compressed height and stroke? I'm having a difficult time finding a shock short enough to not bottom out. Are dyno graphs available for these shocks? I haven't heard of them. I autoX my camaro competitively. I'm currently running Koni yellows.

UMI Sales

The beauty of the 2-1/2" coilover spring is you can get anywhere from 80 lbs/in to 600 lbs/in.

The C211 which comes standard has a ~ 15.5 inch ride height whereas we can special order C209 with a 13.75 inch ride height.

Our kit provides the double shear mounting to accommodate double rod end shocks and true 2-1/2" coilover springs so really, the options are limitless.

Viking's management came from upper mgmt at QA1 so they know what they're doing for sure.

I've attached the theoretical dyno curve. You'll notice this data is a representation intended to give you the idea of how the curves look. A real curve would of course have some noise and the lines wouldn't be perfectly straight...

SlickTrackGod

It's my idea and a terrible copy of my design I gave to Steve Spohn over 10 years ago. It did not "just get real". The way UMI is marketing it will cause the chassis to fail. This plate needs to be 3/16" thick and NEEDS to be welded aroung the spring pocket as well as the perimeters of the plate in this larger format.

UMI small design as well as merely held by a bolt in the stock shock location will cause the plate to eventually wobble enough and punch right through the chassis without load support of welds on the spring pocket. Terrible redition of something that was invented over a decade ago people. Umi- Make the plate larger and require welding. you'll thank me later- trust me.

The shock you use is certainly a little better then the crap QA1 Spohn sells, however, it is only interesting to the drag race crowd. The Koni someone else here listed is the optimum monotube because it cam be mounted upsidedown to reduce unsprung weight (critical to optimum handling and ride quality on any car) and can be easily run just as Roostmeyer suggested. It is a far better shock- I run that very shock on 2 other vehicles of mine in custom applications and yes it fits the 3rd gen rear perfectly when lowered and used with my plate design Spohn sells.

Dean

UMI Sales

Our upper plate is 3/16" thick and customers are welcome to weld it.

The teardrop design and double shear is dictated by the shape of where it is mounted.